Q&A with Mark Sirangelo, leader of Sierra Nevada Space Systems

SpaceX’s Dragon supply ship reached the International Space Station on Wednesday, with astronaut Jeff Williams grappling the unpiloted spacecraft with the research lab’s robotic arm at 6:56 a.m. EDT (1056 GMT) after an automated rendezvous.

The Antares rocket, Orbital ATK’s medium-class booster now with modern RD-181 engines, launches at 7:45 p.m. EDT (2345 GMT) from NASA’s Wallops Flight Facility on the eastern shore of Virginia.

Russian launch crews stood up a Soyuz rocket Sunday on its launch mount in Kazakhstan for a scheduled liftoff Wednesday with approximately 5,500 pounds of supplies, experiments, fuel and several small satellites to be released by spacewalking cosmonauts at the International Space Station later this year.